fuse: simplify req states

FUSE_REQ_INIT is actually the same state as FUSE_REQ_PENDING and
FUSE_REQ_READING and FUSE_REQ_WRITING can be merged into a common
FUSE_REQ_IO state.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Ashish Samant <ashish.samant@oracle.com>

fs/fuse/fuse_i.h

@@ -243,11 +243,9 @@ struct fuse_args {
 
 /** The request state */
 enum fuse_req_state {
-	FUSE_REQ_INIT = 0,
-	FUSE_REQ_PENDING,
-	FUSE_REQ_READING,
+	FUSE_REQ_PENDING = 0,
+	FUSE_REQ_IO,
 	FUSE_REQ_SENT,
-	FUSE_REQ_WRITING,
 	FUSE_REQ_FINISHED
 };